The observed infall of galaxies towards the Virgo cluster

Understand

We examine the velocity field of galaxies around the Virgo cluster induced by its overdensity.

• A sample of 1792 galaxies with distances from the Tip of the Red Giant Branch, the Cepheid luminosity, the SNIa luminosity, the surface brightness fluctuation method, and the Tully-Fisher relation has been used to study the velocity-distance relation in the Virgocentric coordinates.
• Attention was paid to some observational biases affected the Hubble flow around Virgo.
• We estimate the radius of the zero-velocity surface for the Virgo cluster to be within (5.0 - 7.5) Mpc corresponding to (17 - 26)^\circ at the mean cluster distance of 17.0 Mpc.